Breast cancer is the most common and prevalent malignancy among contemporary women, with approximately 1.2 million women diagnosed with the disease and 500,000 women dying from it each year worldwide. Currently, the incidence of breast cancer is increasing rapidly in many cities in China, which has attracted close attention. The causes of breast cancer are related to many complex factors, such as high fat and low fiber diet, weight gain after menopause, smoking, radiation exposure, pesticides and other harmful stimuli, as well as genetic factors. Studies conducted by relevant institutions in recent years have further revealed that the occurrence of breast cancer is closely related to the level of estrogen that accompanies women throughout their life, so there are also many risk factors for the occurrence of breast cancer in terms of marriage, fertility and sex. Early menarche (before the age of 12), late menopause (after the age of 50) and long menstruation (more than 35 years) are recognized risk factors for the development of breast cancer. Some studies have reported that the risk of cancer in women with menarche earlier than 13 years old is 2.2 times higher than the normal age of menarche of 17 years old; the risk of cancer in women with menopause >55 years old is about 1 times higher than that in women with menopause <45 years old. The incidence of breast cancer is significantly higher in women who are single, unmarried or not pregnant at the age of over 40 or whose first child is older than 30 years old than in women who are married at the normal age, and the incidence of breast cancer in women whose first child is born at full term before the age of 25 is only about 1/3 of that in women whose first child is born at full term after the age of 30. Women who give birth but do not breastfeed, or who breastfeed for a short period of time, or who breastfeed with only one breast, are also likely to have an impact on the development of breast cancer. Therefore, proper breastfeeding after childbirth can keep the breast glands open and prevent the occurrence of breast cancer. If you rarely breastfeed or never breastfeed, your breasts are likely to accumulate milk and the risk of breast cancer increases significantly. 3. The quality of sexual life between husband and wife directly affects the physical health of the breast. In recent years, the incidence of lobular hyperplasia and benign and malignant tumors of the breast has increased rapidly, which has attracted the close attention of the medical profession. A special survey in China found that 86% of women with lobular hyperplasia never had an orgasm in their sex life. If a woman is often sexually excited but cannot reach orgasm, her body will feel extremely uncomfortable and the sexual tension that is not released in time will easily turn into cramps and pain, which over time will produce psychological and pathological "depression" and lead to lesions in the breast tissue. The conclusion of the study on the psychological characteristics of breast cancer patients also shows that the degree of depression and anger internalized by breast cancer patients is higher than that of healthy people. 4. Repeated abortions increase the likelihood of breast cancer in women. A study shows that natural abortion does not increase the risk of breast cancer; however, women who have had abortion before the age of 18 have a 110% higher risk of breast cancer than those who have not had abortion. This is because after each abortion, the pregnancy is abruptly interrupted and the hormone level in the body suddenly drops, causing the newly developed mammary glands to suddenly stop growing, making the alveoli smaller or even disappear, and the mammary glands to recover. This recovery is generally incomplete and can easily cause breast lumps and breast pain, which can induce breast diseases, so that repeated breast lesions can become a cause of breast cancer. Therefore, Wuhan Tongji Hospital Plastic Surgery Professor Wu Yiping reminded contemporary women to raise their awareness of self-care, although the state advocates late marriage and late childbirth, but not too late, women should preferably marry before the age of 28. It is also important to keep an open mind, avoid depression and anger, and maintain good physical and mental health. These are all essential to prevent and reduce the incidence of breast cancer.